Piston packing



Patented Apr. 12, 19271 i UNITED STATES` PATENT OFFICE.`

camas Las coox, or Lotrrsvmnn, xmr'rucxr, suenen ro c. Las: ooox 'llanurasronnre conrm, or LOUISVILLE, mwen, A coarona'rron or mmm.

IPISTON PACIIN G.

application filed January The present 4invention relates more particularly to piston rings, and the object is mine the pressure for the particular conditions to be encountered.

In the accompanying drawings:

Figure 1 is a detail sectional view on an enlarged scale through a portion of a piston andacross an embodiment of the novel packis shown in two in mechanism. v

i ures 2 and 3 are sectional views, respeotively, on the lines 2--2 and 3-3 of igure 1, but on a smaller scale and showing the complete cylinder and piston therein.

In the embodiment disclosed, the piston arts, designated respectively 4 and 5, the dies of said parts having flanges 6 and 7 that produce 1n the peripheral portion of the piston an annular recess 8. In this recess is located a iston ring 9, 'preferably of a single piece, an hav ing, its internal diameter slightly greater than the diameter of the body of the piston 45, so that the ring is free to have lateral play or to flat. rlhe piston ring 9 is provided with peripheral annular grooves 10' that are of substantially L-shape, or in other words, these grooves have offset portions 11.

Between the ooves there is formed a relief groove 12 an passageways 13 lead from the inner portions of the offsets 11 to said relief groove 12.

In the `ooves 10-11 arelocated packing rings, anlas these rings are duplicates, a descnption of one, it is believed, will be sufficient. The rin is made up of a plurality of sections 14, three being illustrated, and said ring is L-shaped in cross section. The main body, designated 15, fits in the main portion of the groove 10, and the flange 16.

1s located in the offset 11. The outer surface' of the main body 15 is inset, as shown at 17, while the flange portion, which extends outwardly beyond the inset portion,

constitutes a bearing surface 18 and holds the inset surface 17 in spaced relation2 to the cylinder wall. It .will be noted that the 19, 1925. Serin! lo. 8,433.

:ring 15-116 is of slightly less width Ithan the. groove-10, and consequently motive fluid acting agamst one side. of the piston, as indicated by the arrow A, will pass alo ide the piston, and the floating ring 9, and ave free access to the inset surface 17 and the opposite inner surface19 of the body 15 of the ring. Inasmuch as the surfaces 17 and 19 are of the same areas, the steam or motive fluid pressure against the ring will be balanced. In order to insure this, the space behind the flange 16 at the inner end of the offset portion 11 of the groove is made inaccessible to the steam orl motive fluid. To this end the joints between the sections 14 of the ring are bridged by sealing plates 20 at the outer side of the ring, and by L-shaped plates 21 in the angle between the body 15 and flange 16 of the ring sections. This space, it Will be noted by reference to-Figure l is open through the passageways 13 to the relief oove 12.

Inasmuc as the ring is balanced in so far as motive fluid pressure is concerned, in order to obtain a predetermined and desired. outward pressureagainst the ring, coiled springs 22 may be employed that operate against the flanges 16,thus urging the ring sections outwardl and creating the necessary bearinfr of the portions 18 against the i cylinder wa With this construction, assuming the motive fluid is operating against one side of the piston and in the direction indicated by the arrow A, this motive fluid, as already indicated, will have equal pressure against the outer and inner faces 17 and 19 of the adjacent packing ring, thus permitting the springs 22 to create a predetermined out- Should ward pressure against the rings.

any fugitive motive fluid through leakage vain access to the space behind the flange 16 1t can readily pass from this space through the passageway 13 to Vthe groove 12, and from this 1groove it will in turn find its wayvthrough t e other groove. or lgrooves past the ring 15v (there beingno pressure aga'il'ist` this ring),v so that the. motive fluid can escape to the exhaust side of the piston. By 1 eliminating the action of the steam or motive fluid against the ring, the variation of pres'- sure against said ring under different steam pressure actions in the engine, is eliminated 'and a constant pressure can be obtained by mechanical means, so that the vnecessary nu. I

i i l A viously packing action can be obtained with a minimumfamount of friction an wear. Ob-

upon the introduction ofv steam to the c luiderv on the op osite side of the Aiston, t e ,ring adjacent t creto, which was ormerly inactive, becomes the active pack'- `.ing element and the left-'hand ring becomes inactive, sov that the above operation takes I place, but with the other ring as the activ packing member for the iston. f j

From the foregoing, it 1s thought that the construction, operatlon and many advan-v tages of the herein described invention will be apparent to those skilled inthe art withunthe advantages-of the invention.`

" opposite sides of the piston and vent as# rings to the i sageways opening from the inneisides o ,the periphery ofthe ,piston between the rings.

2. The lcombination with 'a'pistonand .la piston ring carried thereby, .of substantially -shaped packing rings carried by the iston ring, means for admitting motive: uid against the innerand `outer surfaces of the say communication packing rinl and exhaust permitting v means forme in the piston ring and having' behind the inner facesof the'- A iiange's of the packingrings.

. 3. Thecombmation wit'ha piston l and a4 piston ring carried thereby, o f substantially -shaped packing rings vcarried by the ton ring, means foradmittingmotive uid. ture.

i against the inner and outer surfaoes'o'f the League 'A of the rings bearing packin rings, an channe 'in the piston 4ring be Ween the lianges of thev packing rings, said piston' ring havin exhaust ports .extending to points behin the ilangesof the packing rings and said ports being incominunication with the channel.

. 4.-.y The combination with a piston .a peripheral groove and a piston ring in.

d an exhaust said groove provided with spaced peripheral grooves, packlng rings 1n said grooves, and

vmeans for, admitting motive fluid from opposite sides of the piston respectively to -the inner portions of the grooves and against internal surfaces of the rin said piston y rin having outlet ports for ugitive'motive flui extending from the inner sides of the piston"ring. grooves to the .periphery between the grooves.

, -"5 The combination with a iston having an'annular recess 1n its' erip eral portion,

of a piston ringtherein aving spaced' substantial] L.shapled grooves'in its outer por; tion, su tantia y `shaped packing rings in said grooves, 'the outer surfaces of the mamhodies of said rings' being inset to permit the access of motive' fluid .thereagainst, and the outersurfaces ofthe anges a ainst ,the cylinder wallsA and holding inset surfaces in spaced .relation thereto, said packing rings and groove wall'sbeing spaced to permit the access of motive Huid behind the main bodies 'of the rings, means for. sealingI the inner surfaces of the packing ringanges against the passage ofmotive uid the`retlo, said :piston ring having a peripheral oove be-v tween the packing rings, and e aust passageways leading fronithe inner vsides of the packing'ring' iian s to saidgrooves.

In testimony yvvV reof, my 

